Artificial tooth.



No. 852,266. 'PATENTED APR. 30, 1907. B. DE W. R. GARDEN. ARTIFICIAL TOOTH. APPLICATION FILED JUNE 11. 1906.

To all whom it may concern: v i

. celainfacings and metal-backings for bri gerender the same stronger, more durablefand tures, of construction, combination .and'arrangement of devices shown, I construct the metal backing 1 and of the drawing the rear face of the porcelain skilled in the art to which it nectionbetween the latter and its metal they may be connected without the use of bears no strain.

ERNEST DE WITT'R. GARDEN,

ARTIFICIA No. 852,368. Specification of OF TARRYTOWN, NEW YORK.

Letters Patent. IE'etented April so, 1907.

Application filed Jane 11,1906. Sprlal lo-321,224.

Be a known that I, ERNEST DE Wrr'r R. GARDEN, a citizen of the United States, re'sidin at 'larrytown, in the county .of Westch'ester and State of New York, have invented certain new and useful Improvements in Artificial Teeth and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others appertains to make and use the same.

My invention relatesto improvements in artincial teeth, and more particularly to orwork and crowns.

One object of the invention is to so construct artificial teeth that. the'strain is removed from the porcelain facing and the con backing. r Another object of the invention is to improve and simplify the construction of artificial dentures of this character; and thereby With the above and other objectsin view, my. invention consists of certain novel -fea-' hereinafter described aniinclagmed. dr

t e accom anymg' swings -F1.gur' e 1- is a vertical sectibnal view throughone of my improved artificial teeth adapted 'for use in the lower jaw; Fig. 2 is a transverse orhorizontal sectional view through the same; Fig. I 3 is a rear view of the porcelain facing .of a tooth; and Figs. 4, dead 6 are views similar to Figs. 1, 2 and 3, showing a slightly modified formof the invention embodied in a tooth adapted for use in the upper jaw. In the embodiment of my invention herein the porcelain facing 2 of the tooth so that small pins, which so readily break, and so that the strain is removedfrom the porcelain facing and the connection between it and the metal backing." Thefaces are molded with their backs made convex throughout their length and by this curve, strain on the acing is greatly lessened and the occludin edge In the form shown in the first three figur'es facings 2 are made of convex'shape lon itudior channels 3. Theportion' or tongue 4 is' adapted to enter a cavity or seat 5, formed in the metal backing l, b providing the latter with onverging, angu arly-dispo'scd ribs (3, which atter are adapted to enter the grooves 3 The above ob'ect is accomplished as shown in Figs. 4, 5,. an 6, of the drawings, by forming 'in the rear face of the porcelain facing convex longitudinally and with a tapered dovetail groove or channel 7, which is adapted to receive a similar-shaped projection or enlargement 8 upon the metal backing. The backings and facings are cemented together, and owing to their peculiar sha es cause the strain on the edge of the pores ainfacing to Che thrown u on the metal portion of the tooth which. is shown in Figs-1, 2 and 3, and

which is for u: e on the lower jaw, the tapered. dovetailed portion 4 has its broadest end uppermost or nearest the outer biting edge 0 the tooth, while in the form of tooth which is' shown in the last three figures of the drawing, and which is for use u n the upper jaw, 'has its ta ered,, dovetai ed ortion 8 arranged so at its broadest on is lowermost or adjacent to the lower cutting edge of the tooth.

Ifhe metal backings are made to fit the porcelain facingrs, preferably by prv.. in;z or

burnishing'metal, such as gold or p atina, upon the inner faceof the facin then removing this metal, painting its su acc which was in contact with the facing, and flowing solder u on its opposite side or face to stiffen it.

The backing isthen re laced upon the facing and .fittcd to the'mo el, as inbridgcwvork;

then wax the backing with a stiff wax and carefully remove the facing. Invest tho backings as in bridge-work; then solder all -backin s to their proper anchor es. Rc-

move t 1e investment and cement t .e facings to .,their -respective places. The coxistruction, use, and advantages of these facings and backings will be readily understood. The can be used for both low'cr and upper teeth and are easily applied by the operator.

There will be no .elay in removing tl1e'in' vestment from the cast. and no waiting for it to cool. The facing will be stron with little nally and have formed therein upwar y and orfno metal showing, and will ave a firm back. There will he no checking and the j dercut grooves diverging toward the cutting 15 color will always renmin the seme edge thereof, and a metal backing having Various changcsiin the form, proportion, spaced ribs diverging to conform to the uni the mi nor details of construction may be grooves in the face and adaptedt'o fit therein, I'QSOI'Uii to without ricq'nirting from the prinwhereby the strain on the edge of the facing cipic or sacrificing any of the advantages of j is thrownupon the metal backing and its 20 this invention, 11" iifffillkii by the appended connections. N 4 l i 7 v 1 I In testimony whereof I have herelinto set v I 'iug thu dcscriberlmy invention, what rny-hand in presence of two, snbsciibing witchi 1 as new, and desire to secure :byLetnesses. tcrs Patent, is,- j

An artificial tooth comprising afacingl havf Witnesses: in a icngitudinaliy convex inner face pro- FRANK' D. Braces, video with spa-(Jed inwardly-extending. un- CLARA'R. GARDEN.

'mmiisr E WITT n; GARDEN. 

